Integration with constants?

[John W. Eaton]

On 11-Nov-2006, Jens Benecke wrote:

| I am trying to integrate a function that has constants previously defined in
| the same matlab file. Like this:
| 
| [J2, ier, nf,   err] = quad(@(x) log( ...
|         sqrt(1 + alpha.^2 + 2.*a.pha.*cos(2.*x)) + alpha + cos(2.*x) ), ...
|                 0, pi/2, 1e-6)
| 
| "alpha" is a constant that has been calculated before. However, Octave tells
| me "error: alpha undefined ..."
| 
| Do I have to write a seperate .m file for each function I want to be able to
| integrate? I thought it was possible using the "@(x)" anonymous function
| syntax.
| 
| I would appreciate any help or pointers to the right documentation. Thank
| you!

What version of Octave are you using?  This works in 2.9.9:

  octave:1> a = 2
  a =  2
  octave:2> quad (@(x) x + a, 0, 1)
  ans =  2.5000


jwe